Box assembly machine



y 1953 R. E. SWISHER 2,637,252

BOX ASSEMBLY MACHINE Filed Jan, 14, 1950 9 shets-sheet 1 JNVENTOR, Mia/"f E filmy/h ir WWW/744 May 5, 1953 Filed Jan. 14, 1950 R. E. SWISHER BOX ASSEMBLY MACHINE 9 SheetsSheet 2 INVEN TOR,

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BOX ASSEMBLY MACHINE Filed Jan. 14, 1950 9 Sheets-SheetA 5, 1953 R. E. SWISHER 2,637,252

BOX ASSEMBLY MACHINE Filed Jan. 14, 1950 9 Sheets-Sheet 5 War/75y i 5, 1953 R. E. SWISHER 2,637,252

BOX ASSEMBLY MACHINE Filed Jan. 14, 1950 9 Sheets-Sheet 6 y 5, 1953 R. E. SWISHER 2,637,252

- BOX ASSEMBLY MACHINE Filed Jan. 14, 1950 9 Sheets-Sheet 7 M y 1953 R. E. SWISHER 2,637,252

BOX ASSEMBLY MACHINE Filed Jan. 14, 1950 9 Sheets-Sheet 8 WI H E'mh l WA O I l A90 l flll lllfllq lllll lll'l.

5, 1953 R. E. SWISHER 2,637,252

BOX ASSEMBLY MACHINE Filed Jan. 14, 1950 9 Shets-Sheec 9 lI/I/I/I/II/IIIIIIII/A /f// A 934 Z INVENTOR, Paw/f Z. Jkwsfiy:

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Patented May 5, 1953 UNITED STATES PATENT OFFICE BOX ASSEMBLY MACHINE Robert E. Swisher, Kansas City, Mo., assignor to Robert E. Swisher, Charles C. Cockrell, and Earl L. Cossairt, all of Kansas City, Mo.

Application January 14, 1950, Serial No. 138,665

Claims. 1

This invention relates to improvement in box assembly machines and particularly to machines adaptable for use in the assembly of flanged boxes and specifically for heart shaped flanged candy boxes.

The present method of producing these heart shaped candy boxes is very slow and tedious, thus making them quite expensive, due principally to the labor cost. The present machine is designed and constructed to produce a predetermined number of boxes per hour when operated at a given constant speed. Furthermore, when producing less complicated boxes the speed may be varied to produce the product at a higher rate of speed.

The principal object or the present invention is the provision of a box assembly machine comprising a frame including a vertically disposed standard, carrying a work table for horizontal rotation, a series of base forms carried by said table in peripherally spaced relation about said standard, an operating cam mounted for rotation on said standard and having a ratcheted hub, a stop pin adiustably secured to said standard and adapted to engage said ratcheted hub to hold said cam against rotation with said table, an arm rotatably mounted for oscillation on said standard and carrying a packer at its outer end, driving means operable by said rotating table to cause said cam to move said packer to selectively engage work on one of said base forms, and means associated with said driving means and operable by said rotating table to release said driving means and cause said arm to move to its starting point to engage the work positioned on the next succeeding base form.

Another object of this invention is the provision of a box assembly machine suitable for assembling and gluing flanged boxes of various forms and shapes, or for assembling substantially any boxes requiring the gluing together of box parts.

Other objects are simplicity and economy of construction, ease and efiiciency of operation and adaptability for use for any operation requiring a press operation.

With these objects in view, as well as other objects which will appear during the course of the specification, reference will be had to the drawings wherein:

Figure 1 is a top plan view of the box assembly machine with the parts in the registered relation to start the sealing operation and embodying this invention.

Figure 2 is a view similar to Fig. 1 with parts moved forward to the pressure applying stroke and with parts broken away.

Figure 3 is a side elevation of the machine with the operating parts in the position shown in Fig. 2.

Figure 4 is a vertical sectional view taken on line IV-IV of Fig. 2.

Figure 5 is a horizontal sectional view taken on line VV of Fig. 4.

Figure 6 is a horizontal sectional view taken on line VI-VI of Figure 4.

Figure '7 is a horizontal sectional view taken on line VIIVII of Fi 4.

Figure 8 is a horizontal section taken on line VIIIVIII Of Fi 4.

Figure 9 is an enlarged sectional view taken on line IX-IX of Fig. 5.

Figure 10 is an enlarged detached perspective view of the outer end portion of the box forming arm shown in Fig. 9.

Figure 11 is an enlarged fragmentary sectional view of the box forming arm shown in Fig. 9.

Figure 12 is an enlarged plan view of the operating cam and its associated parts positioned in the compression stroke.

Figure 13 is an enlarged plan view of the operating cam and associated parts at the end of the compression stroke, and with the cam shown in retracted position in dotted lines.

Figure 1415 an enlarged elevational view of the upper end portion of the center standard with associated parts and with parts broken away to show the clutch structure.

Figure 15 is a sectional view of a portion or the parts shown in Fig. 9 with the pressure foot in position thereon.

Figure 16 is an enlarged sectional view taken on line XVI-XVI of Fig. 1.

Figure 17 is a cross-sectional view taken on line XVII-XVII of Fig. 16.

Figure 18 is a disassembled view of the parts that make up a heart-shaped box cover.

Figure 19 is a sectional view of an assembled heart-shaped box cover.

Figure 20 is a plan view of a plain box cover leaving a cut-out window.

Figure 21 is a sectional View taken on line XXI-XXI of Fig. 20.

Figure 22 is a separated view of the parts of a rectangular flanged box or box lid.

Figure 23 shows the box parts shown in Fig. 22 in assembled relation.

Figure 24 shows the box parts shown in Fig. 22 in position in the machine for forming.

Figure 25 is a sectional view taken on line IQiV-XXV of Fig. 14.

Figure 26 is a modified form of the table structure with the work held in position by means of three detents.

Figure 2'7 is a modified form of the base form adapted to serve as a cutting base to receive a cutter to form windows in box cover members.

Throughout the several views like numerals designate similar parts and the numeral it) designates a frame of substantially rectangular open form and having corner legs I2, diagonally disposed lower cross members I I, a substantially horizontally positioned marginal top plate I8, and top cross bars I8. Securely mounted on table plate I8 by means of machine screws adjacent the rectangular corners is a bearing block 22 each of said blocks carrying a radially disposed bearing shaft 24 upon which is rotatably mounted a series of rollers 25 which serve as bearings for a rotatably mounted planar table plate 28. Top plate is is provided along one side with an extension 36 which serves to support another bearing block 22 which also carries a radially disposed shaft 2:; on which is rotatably mounted a like series of rollers 26. Corresponding rollers of all of said series are spaced at like radial distances from the center of rotation of said table plate 28.

The main center standard 32 comprises a shaft mounted in a relatively large tubular socket 3t welded to cross members It and provided with a series of radially spaced-apart set screws 38, whereby the lower end of standard 32 is adjustable to maintain it in proper alignment with the frame ID. A sleeve 38 centrally secured in position between cross bars I3 and transverse bars 46 is secured against rotation by set screw 32 and serves to secure standard 32 firmly in its central position in relation to frame Iii. This sleeve 38 extends above the frame to a point ad- J'acent the under surface of table plate 28 and is provided at its opposite end portions with internal bushings 44 which in turn support an elongated sleev 4'6 having a snugly fitted bushing A8 which snugly fits standard 32 to hold the parts in proper relation. The upper end of sleeve 46 is provided with a bushing 59, having a flanged head 52, having a planar face M, which is tightly secured to the lower surface of table plate 28 by bolts 49 to secure it with said table plate upper planar surface in perpendicular relation to the axis of standard 32. With this mounting of the table plate it is apparent that by proper setting of set screws 36 the plate 28 may be properly adjusted to rest on rollers 26. Mounted on said table plate concentrically with the axis of standard 32 is an internal spur gear 56 which is secured in position by bolts 58.

Means for rotating table 32 comprises a variable speed motor 60 mounted on movable base 62, and operable by hand wheel 64. Belt wheel 66 is driven by motor 68 and operatively connected by belt 68 with belt wheel 1i) mounted on drive shaft '12 of the speed reducing means I4. This speed reducing means has a driven shaft Hi which is provided at its upper extremity with spur pinion '53 which intermeshes with internal gear 56 to rotate table 23 in the direction indicated by the arrows. A bearing 86 mounted on plate 82 serves to support shaft I9 adjacent pinion I8. Plate 82 is secured to cross bar i8 by welding. Shaft 75 is split and provided with a suitable connector 8 2 to permit slight relative movements as the standard 32 is being adjusted as above set forth.

An angle member 86 secured to frame I ll by welding extends above said frame a distance equal to the height of standard 32 and is connected thereto by means of a bar 88 secured at its opposite ends to standard 32 and angled member Elli by screws 5i! and 92, respectively. Bar 88 is disposed on a radial line and thus serves to stabilise the standard 32 and secure it against accidental movement.

Referring to Figs. 4 and 5 it will be noted that a cam G4 is adjustably mounted on standard 32 by means of set screw 96, in slightly spaced-apart relation above table plate 28. The cam face 98 can be mad of any suitable form to perform the desired movements of the movable parts. In the present showing the cam is made with a circular high section iiiii and a relatively low circular section it? which remain stationary as the table plate is rotated, thus completing a complete action of the cam at each full rotation of the table plate.

lhis machine is constructed to carry out various operations in the manufacture and assembly of various types of cardboard boxes such as flanged boxes, heart-shaped flanged boxes, windowed boxes, etc. The present showing provides for a machine best suited to make heart-shaped candy boxes which are perhaps among the most difficult to assemble and glue. The construction of this box is best shown in Figs. 18 and 19, wherein body members I64, I66 and top member its are preformed for positioning on the machine as hereinafter set forth.

the assembly of the heart-shaped boxes, a plurality of base forms I Iii of substantially heart shape are secured at substantially equally spacedapart distances to the marginal top surface of planar table plate 28, by means of screws III. The screws are countersunk into the top surface of form i it so as to present a smooth top surface for receiving the flat box parts. These basic forms are disposed lengthwise on radial lines with the point of the heart at the extreme distance from the center of table 28, thus presenting the heart crease H4 in alignment with its respective radial line.

Referring to Figs. 9, 10 and 11, which best show the construction of the parts operable by cam it will be noted that adjustable bar H6 is slidably mounted in blocks I I8 and IIQ rigidly fixed to the top surface of table plate 28. -Bar Iii} is provided with an end member I20 which is bored at I22 to receive the rounded end portion I24 of bar HE. A set screw I26 mounted in end member He serves to engage and secure this end member in adjusted position on the rounded end position I 24 of bar II 6.

End member I 29 is provided on its top side with a vertical standard I28 which is adjustably threaded into the end member at I 30 and provided with a set nut I32 and head I34 having a transverse opening I36 formed therethrough to receive a bar hi8 having a head M0 which serves to contact and position the top member I 08. The set screw Hi2 mounted in head 32 serves to secure the bar in a fixed adjusted position to properly position top member I98.

End bar member I20 is also provided with an outwardly projecting blade I44 which is mounted beyond the outer end of member I20 on a bar In which extends over member I20 and is secured thereto by means of screw I48. This blade is adapted to be adjusted to engage the heart creas lid of the body member I04 to hold it in proper form about base form IIO during the sealing operation. The inner end of bar I I5 is provided with a horizontally disposed, rotatably mounted roller I50 secured for rotation by shouldered screw I52. This roller IE0 is held in operative relation with cam 94 by means of a compressed spring I54 mounted on bar II6 with its one end resting on the inner face of block H9 and with its other end positioned against a washer I56 secured against inward movement on rod II6 by means of a key I58 passing therethrough. This key I58 is always spaced outwardly from block I I8 50 that the roller will always be urged against the face of cam 94.

There are four like sets of pusher bars, just described, which are shown spaced apart at regular intervals of 90 (degrees) and for convenience of identification will be numbered as I69, I62, I64 and I66 clockwise about the table plate in the direction of rotation.

A further detent I68 is secured by screw I19 to table plate 28 in spaced relation to each base form II9 to extend thereabove to serve as a back stop for top member I98 before pressure is exerted to bind the glued box parts together, as hereinafter described.

To the rear of each of said pusher arm assembly is an adjustably mounted driving block I12, slotted at I14 and secured to table plate 28 by screws I16. These screws are adapted to be set to secure the driving block tightly to the table plate and serve to oscillate pressure arm I18 through predetermined degrees as the table plate is rotated at a substantially uniform rate of speed in one direction.

A pressure arm I18 is mounted on a hub I89 rotatably carried on standard 32 and is provided with a carriage I82 suitable for supporting a vertically slidable bar I84 carrying a pressure foot member I86 having a planar pressure plate I88 of a suitable shape to cooperate with base form. I I9 to properly press the box parts together. Hub I89 is secured against longitudinal movement on standard'32 by lower set collar I99 and upper set collar I92. Mounted rotatably above standard 32 on set collar I92 is a lobed operating cam member I94 having a ratcheted, integral hub I96 having four equally spaced ratchet teeth I98 and four ratchet notches 299 with inclined walls 292 formed in its outer face. Cam member I94 is provided with four equally spaced lobes 294 terminating at their bases in arcuate recesses 296 and each having a substantially planar forward face 298 and convex rear face 2I9.

Positioned on standard 32 directly above the ratchet hub I96 is an adjustable set collar 2I2 adapted to be adjustably fixed to standard 32 by means of set screw 2I4. This collar 2I2 is provided with a side lug 2I6, recessed at 2I8 to receive a vertically movable stop pin 229 having a reduced upper end portion 222 adapted to receive a compression spring 224 which bears against a U-shaped bracket 226 secured on the top side of set collar 2I2 by screws 228.

Adjustably mounted on standard 32 just above set collar 2I2 is a collar 239 which is adapted to be secured in fixed relation to said standard by means of set screw 232, and has a peripheral boss 234 which serves to receive a vertically disposed bearing pin 236 which carries parts hereinafter described.

Securely fixed adjacent the top portion of member 86 is a bracket 238 having a curved neck 246 to which is pivotally secured the rearward end of cylinder 242 by means of a pin 244. Mounted in cylinder 242 on a piston rod 246 is a piston head 248 which is adapted to move in the piston to regulate the speed of travel of pressure arm I18 to which the outer end of said piston rod is pivoted by means of pin 259. Cylinder 242 is provided at its forward end with a stuffing box 252 through which the piston rod 246 works. Mounted in the rearward end portion of cylinder 242 and communicating therewith is a valve stem 254 having a click valve 256 at its outer end to admit air into the cylinder 242 when the piston is on its outward stroke to close when the piston is on its inward stroke.

Mounted in valve stem 254 below the click valve is a pet cock 258 which can be set to permit a free fiow of air to and from cylinder 242. This pet cock is adjusted to regulate the speed of travel of the piston at the end of its stroke. A hole 269 drilled through the side wall of cylinder 242 is of sufficient size to permit a free fiow of air to and from the cylinder during a portion of the stroke of the piston head in the cylinder.

A helical spring 282 is secured at its one end 264 to member 86 and at its other end to an eye 266 which is secured to pressure arm I18. This spring is adapted to be tensioned as the arm I18 is moved away from member 86 during the operation of the machine and serves to return the arm I18 to the starting point adjacent member 86.

Referring to Figs. 1, 2, 3 and 4, it will be noted that arm I18 is provided on its top side with bearing block 268 having a horizontally disposed opening 219 formed therethrough to receive slidably the operating bar 212. The top portion of block 268 extends outwardly from the block 214 to rest on top of bar 212. A yoke 216 secured at its free ends to member I18 extends over extension 214 and is provided with a set screw 218 which can be adjusted to properly position bar 212.

Bar 212 extends adjacent cam member I94 and is provided on its lower side with a roller 289 mounted on bearing bolt 282. This roller is positioned to engage the cam surfaces of cam member I94 and bearing bolt 282 has a reduced threaded upper end 284 which extends through a slot 286 formed through safety link 288 which is pivoted at its one end to bearing pin 236. Nuts 299 adjustably mounted serve to properly position safety link 288 on said bolt at 284.

It will be noted that inwardly projecting portions 292 of bearing block 268 overlap the cam member I94 to serve as guides for the operating bar 212 when it is on its inward stroke.

A link 294 pivoted at its one end at 296 to the outer end of bar 212 is hinged at its other end by pin 298 to top end of vertical bar I84. When the bar 212 is urged outward by cam I94 as hereinafter described, a tension spring 399 secured at its inner end to eyelet 392 mounted in hub I89 and at its other end to an eyelet 994 mounted in the lower side of bar 212 is extended. This spring is tensioned as the bar 212 is moved outwardly, thus energizing it sufiiciently to urge the bar 212 inwardly after the pressing operation is complete. A helical spring 396 secured at its one end to carriage I82 and at its other end to foot member I86 serves to lift the foot member to facilitate the toggle action of this pressure transmitting means.

The means for driving the pressure foot member I86 in unison with the rotation of table 26 during the pressing operation comprises a driving arm 398 pivoted to block 268 by pin 3I9 with its lower end portion normally positioned in the path of travel of driving blocks I12. A spring 3I2 secured at its one end to arm 398 and at its other end to arm I18 serves to normally urge arm 388 against stop pin 3I4. A connecting bar 3I6 is loosely connected at its outer end to driving arm 308 by pin 318 and at its inner end by pm 320 to a depending arm 322 pivoted at its upper end by pivot 324 to hub 180. A set collar 326 mounted on standard 32 is provided with a stop pin 328 which serves to limit the rotary movement of the lower end of arm 322 whereby the driving arm 308 is caused to be disengaged from driving block Hi2 whereby the arm 11-8 is returned to the starting point by means of spring 262.

The operation of the machine in general is as follows: Motor 60 is energized to drive the table 28 in a clockwise direction at a, suitable speed of travel. The operators positioned about the machine .place the box parts on the base forms Ill) and remove the completed box units from the forms. Fig. 1 shows a plan view of machine with the parts in the normal-starting position shown in solid lines. When so positioned the pressure foot member I66 is in registered relation'with the base form I it and the driving block H2 is inoperative engagement with driving arm 3638, so that the parts will be moved together. When in this position thecam member IM is secured against rotation by stop pin 226 so that as arm H8 is rotated roller 28!] willbe forced to travel up curved rear face 2H! and onto the top surface of lobe 264. This action will cause the pressure foot 186 to be forced tightly against the work positioned on base form l H as shown in Fig. 4. The type of box being formed in the machine is the one shown in Figs. 18 and 19, wherein the parts Hi l and 1-68 are partially formed and positioned on the suitable base form I [0. When desired a stiffening insert Hi6 may be used.

Prior to placing the parts on the form i It, a coat of adhesive is applied to-the parts 1&6 and M58 as shown "in Fig. 18. When the pressure is applied in the manner just described, the parts will readily adhere to form a very durable box member. The "flanged heart-shaped box shown in Fig. 19 is necessarily made of two similar parts-a top and abox section,-adapted to be telescoped together thus requiring only a slight difference in the size of forms I lo and the adjustment of the gauges to properly position the parts 'to form a neatlookingbox.

The pressing operation starts as soon as the roller 28b has move'd up incline'zit and onto the concentric section *ZGfl-of cam as shown in Fig. 2. Referring to Fig. 12, it will be noted that the roller 280 is'shown in'about the center of its packing stroke. In Fig. '13 the parts are shown with the roller 22s at the endof its pressing stroke and with the reduceden'd portion 234-01 bearing bolt position in slot 286 at its outer extremity whereby the rotation of arm I 18 with table 26 will be retarded. Just as this point is reached the driving arm 388 will disengage from driving block l'l2 when arm 322 engages stop pin 328 to secure it against further swinging action so that arm 386 will be moved from in front of block [12. During this rotary movement of Hi? the spring 262 has been extendedand energized sufficiently to return said arm to its starting point as shown in solid lines in Fig. 1. Also spring 36% which has been extended willex'ert a force'to move'roller 280 radially along the inclined forward face 203 of cain lobe to rotate the cam'in an anti-clockwise direction away fromstoppin 226 and intorecess 2&6, thus raising pressure foot member 186 from the work. With roller "2% positioned in recess 296 and with spring "262 energized the arm I18 will be returned *toits normal starting position with the cam moving anti-clockwise therewith so that stationary stop 'pin 22ll will drop-into the next ratchet tooth I98. As the table 28 is still rotating clockwise the driving arm 308 will be moved against pin 3M to the operating position in the path of travel of the driving block I12 so the next succeeding base form Ill with the work mounted for the pressing operation. To control the return stroke by the action of spring 262 the controls for cylinder 242 are properly adjusted to regulate the speed of travel of the piston 248 and to cushion it at the end of its stroke. The cam 94, best shown in Fig. 5, is so positioned on standard 32 as to properly position and support the box parts during the gluing operation. The parts of this positioning mechanism caused by table 28 rotate about the cam 94 so that at each revolution the complete operation is repeated, and four of the units will be produced.

Referring to Figs. 20, 21 and 27 it will be noted that the box cover 336 is of rectangular form and so provided with a cutout window 332. This window is formed on base form 334 by cutting die 336 which is carried by pressure foot member I86. A soft metal insert 333 is positioned in base form 334 to receive the cutting edge of the cutting blade to prevent clulling.

The plain flanged. box 348 comprises a box member 332. having a glued-on bottom plate 344, which extends outwardly from member 342 to present a flange, see Figs. 22 and 23.

Fig. 24 shows the box parts in position in the machine for gluing with a detent 68 at its inside edge.

A modified form of positioning the box parts is shown in Fig. 26 wherein three detents I68 are used for properly spacing the bottom member 344 on the base form.

It is apparent that many forms of boxes might be assembled by this machine as well as numerous types of operations pertaining to the art of box forming and assembling are adapted to be carried on by this machine by proper adjustment of the parts.

I claim:

1. A box assembly machine comprising a fixed vertical standard, a horizontal table carried concentrically on said standard for rotation thereabout, means for rotating said table continuously in one direction, a series of work receiving forms fixed on said table in peripherally spaced relation, an arm carried for axial oscillation on said standard above said table and extending radially thereto, a pressure foot carried for vertical movement at the outer end of said arm, a spring urging said arm pivotally in a direction reverse to the rotation of said table, a releasable driving connection between said table and said arm whereby said arm is turned in the direction of rotation of said table with said pressure foot in registered relation above any one" of said work receiving forms, a cam carried on said standard and secured against rotating in the direction of said table, a cam follower carried by said arm and operable by said cam, means operable by said cam follower to urge said pressure foot downwardly against said form as said arm turns with said table, and means operable by the rotation of said table for simultaneously elevating said pressure foot and releasing the driving connection to said arm, wlier'eupon said spring returns said arm to its original position for a like operation relative to the next following form.

2. A'box assembly machine comprising a frame, a rotatable table carried by said frame, means for rotating said table in one direction, a plurality of work receiving forms carried by said table in peripherally spaced relation, an arm carried by said frame for oscillation coaxially with said table, said arm bein disposed above and radially relative to said table, a pressure foot carried for vertical movement at the free end of said arm, a releasable driving connection to said arm whereby said arm is caused to turn with said table through a partial revolution with said pressure foot in registered relation above one of said forms, means operable by the rotation of said table as said arm turns therewith to move said foot downwardly against said form', means operable by the rotation of said table to simultaneously elevate said foot and release the driving connections to said arm, and resilient means for turning said arm in a reverse direction to its original position.

3. A box assembly machine comprising a frame, a rotatable table carried by said frame, means for rotating said table in one direction, a plurality of work receiving forms carried by said table in peripherally spaced relation, an arm carried by said frame for oscillation coaxially with said table, said arm being disposed above and radially relative to said table, a pressure foot carried for vertical movement at the free end of said arm, an abutment member carried by said table adjacent each of said forms, a driving member carried movably by said arm. and disposed normally in the path of said abutment members, whereby said arm is turned by the rotation of said table, said abutment members being so disposed relativ to said forms that each positions said foot in registered relation above the associated form, means operable by the rotation of said table as said arm is turned therewith to depress said foot against said form, means operable by the further rotation of said table to elevate said foot and to move said driving member out of the path of said abutment members, and resilient means operable to return said arm in a reverse direction.

4. A box assembly machine comprising a frame, a rotatable table carried by said frame, means for rotating said table in one direction, a plurality of work receiving forms carried by said table in peripherally spaced relation, an arm carried by said frame for oscillation coaxially with said table, said arm being disposed above and radially relative to said table, a pressure foot carried for vertical movement at the free end of said arm, a releasable driving connection to said arm whereby said arm is caused to turn with said table through a partial revolution with said pressure foot in registered relation above one of said 5. A box assembly machin comprising a fixed vertical standard, a horizontal table carried concentrically on said standard for rotation thereabout, means for rotating said table continuously in one direction, a series of work receiving form's fixed on said table in peripherally spaced relation, an arm carried for axial oscillation on said standard above said table and extending radially thereto, a pressure foot carried for vertical movement at the outer end of said arm, a spring urging said arm pivotally in a direction reverse to the rotation of said table, a releasable driving connection between said table and said arm whereby said arm is turned in the direction of rotation of said table with said pressure foot in registered relation above any one of said work receiving forms, a cam carried rotatably on said standard and having a plurality of radial lobes corresponding in number and angular disposition to said forms, a ratchet securing said cam against rotation in the same direction as said table, said ratchet having teeth corresponding in number and angular disposition to said lobes, a cam follower carried by said arm and engaging said cam, means operable by said cam follower to urge said foot downwardly against said form as said arm turns with said table, resilient means urging said foot upwardly and said cam follower against said cam, whereby said foot is elevated when said follower passes over a cam lobe, and means operable by the rotation of said table to simultaneously release the driving connection to said arm, whereupon said spring moves said arm in a reverse direction to its original position, said cam ratcheting on said standard during said return stroke.

ROBERT E. SWISHER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 877,891 Horton Jan. 28, 1908 2,238,256 Engel Apr. 15, 1941 2,316,867 Howard Apr. 20, 1943 

